I just finished building the OPenAC1 kit a couple weeks ago and am enjoying playing with it. Any thoughts on an Apple II kit? That would be next level!
Mouser have 6502 (well, actually W65C02S6TPG-14 which is CMOS hence has the extended instruction set) and the 6821 (actually W65C21S6TPG-14). Those parts will allow you to be naughty and run the system faster than 1 MHz.
Huh, a PIC and an Arduino … Using the Arduino as glue logic and the PIC for VGA/USB, and you can throw SD card features in where they fit. Makes sense. Of course it's a very Woz question to ask … could you use one µC and cut the cost? The RP2040 could certainly do all of those functions at the same time. You need some FET level shifters. If you're buying SMT parts and soldering them yourself that's probably cheaper, but if you're buying a Raspberry Pi Pico and a bunch of level shifter modules, probably not. Certainly in the latter case it would take more board space too. What about the µC used in the new R4 Arduino Uno? Maybe, dunno if it has enough I/O. Probably the PIC + Arduino is the cheapest solution currently.
Nice project but I don’t understand the transfer speed from SD into the RAM. A short Programm can be load in Milli secs from SD and automatically started after loading.
Cool. I just got one of your early units from you. ;-) I noticed several errors in that match game. Take a look at lines 80, 100, 140, 155, 300, and 560. Only two are syntax errors, 155 and 560. Is that an actual error in the file or is that just something on the screen?
I'm chasing down an issue when loading from the SD card. Characters will be repeated or skipped by the VT100 emulator, but the data flows correctly to the PIA.
I started off in computers with an Apple IIe. Learned to write these programs. Talk about memories from 1984.
Very cool project! Makes the Apple 1 a lot more accesible.
Pretty cool! Thanks.
I just finished building the OPenAC1 kit a couple weeks ago and am enjoying playing with it. Any thoughts on an Apple II kit? That would be next level!
Really cool. I’d love to learn more about the Apple I/II architecture.
Mouser have 6502 (well, actually W65C02S6TPG-14 which is CMOS hence has the extended instruction set) and the 6821 (actually W65C21S6TPG-14). Those parts will allow you to be naughty and run the system faster than 1 MHz.
Unfortunately the WDC 65c02 does not work with my project. The WDC 65c21 seems to work fine.
@@chrisdavis3055 That's sad. Is it a pinout issue, performance, timing, or something weird do you think?
Great work thank you for sharing
Very Nice! - Logan
Huh, a PIC and an Arduino … Using the Arduino as glue logic and the PIC for VGA/USB, and you can throw SD card features in where they fit. Makes sense. Of course it's a very Woz question to ask … could you use one µC and cut the cost? The RP2040 could certainly do all of those functions at the same time. You need some FET level shifters. If you're buying SMT parts and soldering them yourself that's probably cheaper, but if you're buying a Raspberry Pi Pico and a bunch of level shifter modules, probably not. Certainly in the latter case it would take more board space too. What about the µC used in the new R4 Arduino Uno? Maybe, dunno if it has enough I/O.
Probably the PIC + Arduino is the cheapest solution currently.
Interesting
Nice project but I don’t understand the transfer speed from SD into the RAM. A short Programm can be load in Milli secs from SD and automatically started after loading.
The code is open source and in my Github. I'd love to implement your version.
Cool. I just got one of your early units from you. ;-) I noticed several errors in that match game. Take a look at lines 80, 100, 140, 155, 300, and 560. Only two are syntax errors, 155 and 560. Is that an actual error in the file or is that just something on the screen?
I'm chasing down an issue when loading from the SD card. Characters will be repeated or skipped by the VT100 emulator, but the data flows correctly to the PIA.